Shane oakhill
Phat 49
Hi everyone, happy new year , I hope you all had a great holiday period. I installed new new hpc long tube headers to replace the block huggers I had. They were designed for a c3 corvette and fit in my truck really well except for one small area the size of a quarter with rests on my high performance sump. It brings me to ask what is an acceptable clearance for a header to sump? I will most probably use some header spacer flanges to gain 10mm as I don’t want to dint the headers or the sump. Thoughts?